7 signs your child may have a food intolerance
2. Chronic diarrhea
Possible culprit: Intolerance to gluten (a protein in wheat and other grains) or lactose (dairy sugar). Diarrhea is the gastrointestinal tract’s way of getting rid of problematic substances. Therefore, the most common symptoms of both gluten and lactose intolerance are diarrhea, gas and bloating.
Lactose intolerance is usually the root cause because the enzyme that digests lactose (lactase) is easily inactivated when the gut is irritated. When you’re gluten sensitive, digesting gluten irritates the gut, so almost everyone with gluten intolerance also cannot tolerate lactose, Dorfman says. Thankfully, fermented dairy products such as cheese and yogurt have low lactose levels, so consuming them is often safe.
Action plan: Get a blood test to rule out celiac disease; then eliminate gluten for at least a month. Although the diarrhea could resolve within a week, it may take a few weeks to get a clear picture with school-aged children. “The birthday parties, the grandma visit—there’s often something that causes accidental cheating,” Dorfman says. “You need a longer period to see a trend.”